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[TS] Copy object spread properties in evaluation order (#369) - #409
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Object spread now lowers to ordered CopyDataProperties operations. It copies own enumerable string and symbol keys, reads each copied value through Get, skips nullish spread sources, and lets later explicit properties override earlier copies. The operation is carried through JSON DTOs, Kotlin model conversion, operand traversal, and handlers. This delivery also includes the getter and selected-call semantics already merged internally through #410.
Validation: fresh typecheck and focused frontend tests (39 passed) on the exact rewritten head. The complete semantic stack at original #425 also passed the frontend build and 622 tests. Rebase preserved the original source tree exactly. Frontend/JSON/model correctness does not establish downstream USVM execution support.
Fixes #369
Fixes #381